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Vertical walls are important to ensure that buildings - particularly older ones - stay standing up. And a wall that is vertical is at right angles to the floor. Having said that, my children went to a school where the floorplan of each classroom was hexagonal. Furnishing it was a nightmare but it is an innovative design. An igloo probably has no right angles but most other building do.
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There is no such thing as exactly vertical because either it is vertical or it is not. You cannot have approximately vertical - it is not vertical, then. Vertical means at 90 degrees to the horizon (or horizontal).
by moving vertical
vertical is from side to side